Green synthesis of mesoporous hematite (α-Fe2O3) nanoparticles and their photocatalytic activity

被引：251
|
作者：
Ahmmad, Bashir [1 ,2 ]
Leonard, Kwati [2 ]
Islam, Md Shariful [2 ]
Kurawaki, Junichi [2 ]
Muruganandham, Manickavachagam [3 ]
Ohkubo, Takahiro [1 ]
Kuroda, Yasushige [1 ]
机构：
[1] Okayama Univ, Grad Sch Nat Sci & Technol, Div Chem & Biochem, Kita Ku, Okayama 7008530, Japan
[2] Kagoshima Univ, Grad Sch Sci & Engn, Dept Chem & Biosci, Kagoshima 8900065, Japan
[3] Lappeenranta Univ Technol, Fac Technol, Lab Green Chem, FI-50100 Mikkeli, Finland
来源：
ADVANCED POWDER TECHNOLOGY | 2013年 / 24卷 / 01期
关键词：
Biosynthesis; Green tea; Iron oxide; Hydroxyl radical; Solar cell; GOLD NANOPARTICLES; BIOSYNTHESIS; NANORODS; OXIDES; FE2O3; FEOOH; TEA;
D O I：
10.1016/j.apt.2012.04.005
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A green synthesis method for the preparation of mesoporous alpha-Fe2O3 nanoparticles has been developed using the extract of green tea (camellia sinensis) leaves. This simple and one-step method can suitably be scaled up for large-scale synthesis. The as-prepared mesoporous nanoparticles were characterized by SEM, TEM, XRD, XPS, Raman, UV-visible spectroscopy and N-2 adsorption analysis. The nanoparticles were highly pure and well crystallized with an average particle size of 60 nm. The photocatalytic activity of nanoparticles was evaluated by the amount of hydroxyl radical formation under visible light irradiation detected by fluorescence spectroscopy. The as-prepared alpha-Fe2O3 showed two times higher activity than commercial alpha-Fe2O3 in term of hydroxyl radical formation and enhanced performance in a photoelectrochemical cell. Also, a plausible mechanism for the formation of mesoporous alpha-Fe2O3 has been suggested. (C) 2012 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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页码：160 / 167
页数：8
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